lib: utils: Add fdt_parse_uart8250_node() function

We add fdt_parse_uart8250_node() function which will allow us
to parse a particular DT node as UART 8250 node. This will be
useful in parsing the node pointed by stdout-path.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

include/sbi_utils/fdt/fdt_helper.h

@@ -23,6 +23,9 @@ struct platform_plic_data {
 	unsigned long num_src;
 };
 
+int fdt_parse_uart8250_node(void *fdt, int nodeoffset,
+			    struct platform_uart_data *uart);
+
 int fdt_parse_uart8250(void *fdt, struct platform_uart_data *uart,
 		       const char *compatible);